Windows Server 2016 NXLOG service keep on stopping every few days

When I check the Windows "Services", it is running, but the logs are not transferred.
After restarting the service, it works fine for a few days. After a few days, the logs will not be transferred.
I think that "★" is because the transfer destination server is temporarily offline.
If I can't connect even once, can I connect after that?

2020-11-12 14:41:17 INFOnxlog-ce-2.10.2150 has started
★ 2020-11-12 14:41:17 Error 10.17.140.209 Failed to connect to udp socket: 514; An attempt was made to perform a socket operation on an unreachable host.
2020-11-2009: 56: 06 Warning nxlog service outage
2020-11-2009: 56: 06 Warning nxlog-ce received end request signal and ended ...
2020-11-20 09:56:08 INFOnxlog-ce-2.10.2150 has started